Sailing at the 1912 Summer Olympics

Nynäshamn is a locality and the seat of Nynäshamn Municipality, Stockholm County, Sweden with 13,510 inhabitants in 2010. While interest in the area as a potentially useful port grew from the mid-19th century, it was only with the opening of the railway station to Stockholm in 1901 that Nynäshamn started to develop. During the early 20th Century, Nynäshamn also became well known as a spa town, though most such facilities were closed down before the end of World War I. Main industries arrived through Telegrafverkets verkstäder (the factories of the Government owned telephone company) in 1916 and an oil refinery built in 1928-29 by Axel Ax:son Johnson & Co. The latter still remains though under different ownership and under the name Nynas. Nynäshamn was the venue of the Olympic sailing regatta in 1912. Nynäshamn, which lies about 60 km south of Stockholm, is well known for being one of the places on the Swedish mainland from where ferries to the island Gotland depart. This is a hugely popular destination for Swedes of all ages in the summer months. The Polferries terminal also offer regular routes to Gdańsk in Poland. Several cruise ships on tours in the Baltic Sea also stay in the harbour, because they are too large to go into Stockholm. A harbour party is hosted each summer, as well as local craft fairs. During these events a steam train often runs routes to and from Stockholm. During the summer months, the harbour is packed with boats of all sizes, and bustles with both visitors and locals. There are a number of eateries and boutiques with locally made produce. The main town is mainly modern and the buildings uninteresting generally. A library and one screen cinema is centrally located, and a limited amount of shops catering to mainly to local trade. Many people in Nynäshamn live in apartment blocks, situated in estates, although there are none more than 10 stories high. There are also plenty of villas scattered throughout the town, and terraced houses. Life in Nynäshamn is generally relaxed, in contrast to the bustle of Stockholm. The surrounding nature and sea provides plenty of photographic opportunities, once you get out of the town centre. Crime is low. Nynäshamn is served by Stockholm commuter rail (Pendeltåg) and several bus routes. Popular singer Meja, and ice hockey player Kent Nilsson were born in Nynäshamn.

Nynäshamn Municipality (Nynäshamns kommun) is a municipality in Stockholm County in east central Sweden. Its seat is located in the city of Nynäshamn. In 1974 the former City of Nynäshamn (itself instituted in 1946) was merged with Ösmo, from which it had been detached as a market town (köping) in 1911 and Sorunda, all in the Södertörn peninsula and adjacent islands.

Nynäsgård is a station on Stockholm's commuter rail network, located 60.6 km from Stockholm Central Station and 3.3 km from Nynäshamn station on the Nynäs Line. The station has two side platforms and no ticket barriers. As of 2015, the station had approximately 1,000 boardings per weekday.

Gröndalsviken is a station on Stockholm's commuter rail network, located in the Estö/Gröndal district of central Nynäshamn, 62.4 km from Stockholm Central Station and 1.5 km from Nynäshamn station along the Nynäs Line. The station opened on 18 August 2008, replacing the former station at Nynäs havsbad, approximately 800 meters away. The station consists of a single side platform along a single track and lacks a ticket hall or fare gates. The area surrounding Gröndalsviken includes a park-and-ride facility. As of 2015, the station had approximately 700 boardings per weekday. Along with Bålsta, it is one of the only commuter rail stations in Stockholm with a single track.

Nynäshamn is a station on Stockholm's commuter train network, located in Nynäshamn within Nynäshamn Municipality and is the terminus for the Nynäs Line. On a normal winter weekday, the station has about 900 boarders (2015). The station has three tracks, which end with stop buffers. Entrance to the platform is geographically from the north (the track runs in a half loop through the city and ends in the "wrong" direction). The station no longer has an entrance building or ticket hall, but has weather protection on the platform. Nynäshamn is used as a transfer to the Destination Gotland ferries to the island of Gotland.

Herrö, or Herrön, is an island in the southern part of Stockholm archipelago, which forms part of Nynäshamn Municipality, Stockholm County, Sweden. Herrö is connected to the neighbouring islands of Himmelso and Yxlö by road bridge, and Himmelso is in turn connected to the mainland by a further bridge. The road across the bridges and island is known as the Muskö road and was originally built in the 1960s to provide access to the Muskö Naval Base.

Södertörn Marine Regiment (Swedish: Södertörns marinregemente, designation SMR, was a Swedish Navy coastal artillery unit which operated from 1956 to 2000. The unit was based on Järflotta south of Nynäshamn.

Yxlö is an island in the southern part of Stockholm archipelago, which forms part of Nynäshamn Municipality, Stockholm County, Sweden. Yxlö is connected to the neighbouring island of Herrö by road bridge, and Herrö is in turn connected to the mainland by a further series of bridges. In the opposite direction, Yxlö is connected to the island of Muskö by the 2,895-metre (9,498 ft) long Muskö Tunnel under the waters of the Baltic Sea. The road across the bridges and islands, and through the tunnel, is known as the Muskö road and was originally built in the 1960s to provide access to the Muskö Naval Base.

Lidatorp and Klövsta (Lidatorp och Klövsta) is a locality situated in Nynäshamn Municipality, Stockholm County, Sweden with 340 inhabitants in 2010.

Järflotta is an island in Stockholm archipelago, approximately 5 km (3.1 miles) south of Nynäshamn. Once separated from the mainland by a natural sound, this navigable route was rendered unusable in more modern times by post-glacial rebound and has been replaced by the artificial Draget Canal. The island is a nature reserve.

Draget Canal (Swedish: Dragets kanal) is a Swedish canal in the municipality of Nynäshamn, county of Stockholm and province of Södermanland. Together with other natural channels, it provides a route between the ports of Nynäshamn and Södertälje avoiding the requirement to pass offshore of Landsort, although today it is only used by leisure craft.

Ösmo station is a railway station on the Nynäs Line of Stockholm's commuter rail network, located in the urban area of Ösmo in the municipality of Nynäshamn in Stockholm County. As of 2019, on a normal winter weekday, the station has approximately 1,300 boarding passengers. The station is located on the single-track Hemfosa-Nynäshamn section of the line, and lacks ticket barriers. The journey time from Ösmo to Stockholm City Station is approximately 45 minutes.