P: Grynderupvej (N 56° 47.587’, E 8° 56.944’)
L: Total 14,8 km - Can be divided into two shorter walks of 4.8 or 12.5 km
Like many other lakes Grynderup Sø was drained in the middle of the 19th century, however, it has now been reestablished. The size of the lake is 140 ha, and the total reclaimed area with meadows etc. covers more than 400 ha. At the lake there are bird watching towers, tables and benches, primitive accommodations and a rope ferry in the northern end. The lake attracts many birds.