Zaroślak [zaˈrɔɕlak] (German: Niederwald) is a settlement in the administrative district of Gmina Ruciane-Nida, within Pisz County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 12 kilometres (7 mi) south of Ruciane-Nida, 21 km (13 mi) south-west of Pisz, and 73 km (45 mi) east of the regional capital Olsztyn.