evidence: The 220km2 Semuliki National Park and the nearby 545km2 Toro-Semliki Wildlife Reserve lie on the floor of the Semliki Valley, the 160km-long part of the Albertine Rift Valley, The Semuliki forest boasts a remarkably rich biodiversity. This is partly because it is extremely old, being one a few patches of forest refugia that predate the arid millennia of the last Ice Age.