100 Miles Trail Ultra

100 miles, från sjö till hav — from lake to sea. Head south from Mariefred, the historic town on the banks of Lake Mälaren, crossing Sörmland to the coastal village of Nävekvarn.

2,800 metres of climbing. 60% trail, 30% gravel, 10% asphalt.

The route mainly follows single-track trails, wider farm tracks and gravel roads, with some sections of asphalt. It follows the marked trails of Sörmlandsleden and Eriksgata for much of the way.

Download the GPX file of the route:
S100_100m_260905.gpx

Places are limited. Registration closes when the race sells out, or on race day.

registration

Start: 12:00, Friday 10 September 2027
Gripholms Slott, Mariefred.

Finish: Nävekvarns Folkets Park

Elevation: 2 800 meters

Stifa: 17,39

Registration fee:
1–31 December 2026: 1,950 SEK
1 January–31 May 2027: 2,150 SEK
1 June–31 August 2027: 2,350 SEK
1 September–race day: 2,550 SEK

Race numbers: Collect your race number and GPS tracker at the start only, from 10:00–11:30 on Friday 10 September 2027.

Bus transfer:
Book your bus transfer when registering (100 SEK). Select your boarding point: Nävekvarn, Nyköping or Läggesta. Departure times will be confirmed closer to race day.

Pacer:
A pacer option is available when registering (150 SEK).

    1. Laxne, 14,5 km
      59°11'36.8"N 17°11'05.0"E
      Fruit, candy, chips, Coca-Cola, Umara & water

    2. Sörmlandsleden junction, 32 km
      59°06'34.2"N 17°18'52.9"E
      Fruit, candy, chips, Coca-Cola, Umara & water

    3. Erikslund, 46 km
      59°02'21.7"N 17°13'33.2"E
      Grilled cheese focaccia, fruit, candy, chips, Coca-Cola, coffee, Umara & water

    4. Penningby, 62 km
      58°57'51.5"N 17°08'12.7"E
      Umara & water
      NO SUPPORT ALLOWED

    5. Likstammen, 76 km
      58°56'18.0"N 17°13'42.0"E
      French fries with mayonnaise & ketchup, fruit, candy, chips, Coca-Cola, coffee, Umara & water

    6. Tystberga, 88 km
      58°50'58.0"N 17°14'49.2"E
      Ramen & rice, fruit, candy, chips, Coca-Cola, coffee, Umara & water

    7. Förola, 98 km
      58°49'47.4"N 17°07'12.8"E
      Umara & water
      NO SUPPORT ALLOWED

    8. Söra, 111 km
      58°47'17.7"N 16°59'46.7"E
      Pasta soup with bread, fruit, candy, chips, Coca-Cola, coffee, Umara & water

    9. Nyköping, 121 km
      58.7531, 17.00965
      Hot dogs with bread, ketchup, mustard & crispy onions, fruit, candy, chips, Coca-Cola, coffee, Umara & water

    10. Kila, 134 km
      58°43'37.8"N 16°53'24.3"E
      Fruit, candy, chips, Coca-Cola, Umara & water
      NO SUPPORT ALLOWED

    11. Gälkhyttedammen 147 km
      58°41'31.6"N 16°48'38.3"E
      Pizza, fruit, candy, chips, Coca-Cola, coffee, Umara & water

    12. Nävsjön 156 km
      58°39'44.0"N 16°44'07.6"E
      Sweden Runners Surprise!

    13. Dammkärr 165 km
      58°37'58.0"N 16°45'47.4"E
      Umara & water

  • • Sörmlands 100 Trail Run Buff
    • Live GPS tracking and split times throughout the race
    • GPX file of the route
    • Sörmlands 100 Window Sticker
    • Well-stocked aid stations
    • Access to the finish area at Nävekvarns Folkets Park and the sauna after the race
    • Handmade wooden belt buckle
    • Medical teams on the course
    • Post-race refreshments, locally produced hot food and Mineral Brewing alcohol-free beer

  • Erikslund, 46 km
    Closes at 21:00. Max time: 9 hours.

    Likstammen, 76 km
    Closes at 03:00. Max time: 15 hours.

    Tystberga, 88 km
    Closes at 05:00. Max time: 17 hours.

    Nyköping, 121 km
    Closes at 13:00. Max time: 25 hours.

    Nävsjön, 156 km
    Closes at 20:00. Max time: 32 hours.

    Dammkärr, 165 km
    Closes at 23:00. Max time: 35 hours.

  • The compulsory kit list is as follows:
    • Bottles or Bladder with capacity for 1 litre of liquid
    • Mobile phone with race director and medical team number saved
    • Some form of navigation tool, for example the app Min Karta. This is so that you can give a position in an emergency
    • First aid kit
    • Gps tracker*
    • Race number*
    • Emergency foil blanket or bivi bag
    • Rain jacket.
    • Head torch plus extra batteries/powerbank (or an extra headlamp) 
    • A small red light to be attached to the back of your pack after dark

    *Provided at check in

    However, we also recommend the following:
    • Spare long sleeve top base layer
    • Whistle
    • Hat or buff and gloves
    • Emergency food 500cal (eg 2 Snickers)
    • Cup, The race is cupless which means you must bring a cup with you if you want any hot drinks along the way
    • Emergency money or card

    We are a small organization and as the course is quite long and often hard to access by car, it may take several hours between the time you decide to drop out and the time we can pick you up. Please prepare your kit so that you can keep warm and dry if this situation should occur.

  • Information will be available closer to race day.