Whale river is the next important river toward the east. Off the mouth of this river is a huge island, locally known as Big island. This high island extends parallel to the course of the river, and a reef, connecting its upper end with the mainland, becomes dry at low water. The course of Whale river is not well known. About 40 miles up this stream it suddenly contracts and becomes a mere creek, forming the outlet of a large lake, whose position is not satisfactorily determined. It is to the banks of this lake that certain families of the Indians repair for summer fishing. The next large river is the Koksoak. This stream is the largest in the district. It takes its rise from lakes situated on the plateau--the “Height of Land,”--and pursues a course having a general direction north-northeast. On emerging from the lake it is rather small, but forks and unites again about 40 miles below. The current is sluggish at the upper end, and the eastern branch is so narrow that the Indians have to part the overhanging alders and willows to afford their canoes a passage. This branch is said to be the shorter way to the lake and is not so difficult to ascend, the eastern branch being shallow and containing a number of rapids. Below the junction of the branches the river rapidly becomes larger and contains several very high falls, below which the river flows northwest for a couple of hundred yards and then curves to the north-northeast for a distance of 5 miles. This portion is only about 700 feet wide. It then turns abruptly westward and rushes swiftly through a narrow gorge only 200 feet wide for a distance of about 7 miles. This course is noted for several rapids, through which a boat can not make its way without great difficulty. At the end of this 7-mile run the river again bends abruptly to the east, and continues that course with little northing until the last bend, some 65 miles below, is reached. At the lower end of the 7-mile run the ledges and reefs are too numerous to count. From this place to the mouth of the Larch river the Koksoak is obstructed by islands, bars, and shoals. Below these, however, it becomes quite broad, until nearly opposite the high point or promontory below the mouth of the Larch (Pl. XXXVI). From this locality it is monotonous till the last bend is reached, some 4 miles above Fort Chimo, where it suddenly turns to the north and pursues that direction to the sea with little variation. At the last bend, however, a large island, locally known as Big island, not only obstructs but ends navigation for boats drawing over 6 feet. Small boats, such as skiffs and native boats, ascend to the lower end of 7-mile run. The principal obstruction to travel in any kind of vessel in the Koksoak from Big island to the mouth of the Larch river is the presence of two falls or rapids about 40 miles from Fort Chimo. [Illustration: BUREAU OF ETHNOLOGY ELEVENTH ANNUAL REPORT PL. XXXVI VIEW ON KOKSOAK RIVER.]