River Geitafellsá is a small river in Reykjahverfi and is part of the extensive water system of Laxá in Aðaldalur. It comes from Lake Kringluvatn and flows to Lake Langavatn. This is a good brown trout river and there are good sized fish hiding amongst the smaller ones. Most trout are 400 – 600 gr. Later in the summer, arctic char migrate into the river, from Langavatn, and it is possible to catch good numbers of char in July or August. At Geitafellsá you must be careful along the banks so as not to disturb the fish and there is adventurous fishing on the dry fly when conditions allow.