Lake Saudleysuvatn is situated between four barren hyaloclastite mountains at 581 m above sea level a short distance to the west of the lodges at Landmannahellir on the Landmanna Route (Domadalur Route).  It is hidden from the passers by on the mountain track and is not accessible by car.  The catch consists mainly of small lake char, but some bigger fishes in-between. 
Permits are sold at the lodge at Landmannahellir or on the internet.

 online booking