Lago Sandoval is located relatively close to Puerto Maldonado, and is a beautiful, large, ox-bow lake. It is popular with young locals who come to bathe here, and it can get busy at weekends. It is also possible to see wildlife here, including giant river otters, although these are best seen in the early morning or late afternoon, meaning that you must spend the night here. The lake is located 40 minutes downstream from Puerto Maldonado and then a one-hour walk through the jungle.