The Popidoe River is the longest river in the province of Propinlonge. It begins at the foot of of Heaven's Falls, a very wide and somewhat tall waterfall. The lake that feeds it is fed via near-constant rainfall, and a rumored underground glacier.
The Popidoe streches from the middle of the island to the northwest. A fairly wide and deep river, it is not uncommon to have shallower seafaring vessels travel upstream to Lake Lanbowed, nearly a third the length of the river.