Clealum is situated on the Yakima River, at a point on the Northern Pacific Railway, 122 miles east of the humid, heavily forested coast at Puget Sound. Although situated not over 154 miles from Copalis, on the ocean at the western edge or furthest limit of the temperate humid coast country, the summers are hot and dry and the winters severe. It is 1909 feet above the sea level and far enough towards the summit of the Cascade Mountains, that marks the line between the humid coast and the arid almost treeless interior, to find considerable moisture and many trees.

Ellensburg is situated near the eastern side of the Yakima River, 25 miles below Clealum, at an altitude of 1512 feet above the sea level and in the wide somewhat flat Kittitas Valley which was, in former geologic times, a lake bottom. The river flows rapidly and its low banks at places are high enough to form gravel bluffs. The surrounding country is arid and there is no natural forest growth.

Cherry Creek, one of a number of small streams on this side of the river, flows through the eastern part of this valley, and empties into the Yakima River about one mile below Thrall on Section 31, Town 17, North of Range 19 East. Here, the river enters Yakima Canon which cuts through Umptanum Ridge and the western foothills of Saddle Mountains. There are some pines in this canon.

Selah Creek flows through Selah Canon from the east and empties into the Yakima, about one mile above Selah at the northwest corner of Section 16, Town 14, north of Range 19 East. This is in a broad valley below Yakima Canon. At the time of our visit, however, the lower portion of this creek was dry. Wenas Creek empties into the Yakima from the west, nearly opposite Selah.

North Yakima is on the western side of the Yakima River, about two miles below the mouth of the Naches, which empties into the Yakima from the west, immediately below where the latter breaks through Yakima Ridge. This break is called the Gap or the Upper Gap. North Yakima is at an altitude of 1067 feet above the sea level. The soil of the valley is made up of a rich volcanic ash and the region is arid and practically treeless except on the banks of the rivers and creeks or where irrigation has been successfully practised. The climate in most respects resembles that of the southern interior of British Columbia, lying to the north, but in general, there is less vegetation except on irrigated land.

Cowiche Creek flows from the southwest and empties into the south side of the Naches, at a point about three miles above its mouth.

Tampico is situated on Section 17, Town 12, north of Range 16 East, on the north side of Ahtanum Creek, which flows nearly east along the base of the north side of Rattlesnake Range and empties into the Yakima at Union Gap or Lower Gap, below Old Yakima.

Fort Simcoe is located in a cluster of live oak trees, on one of the branches of Simcoe Creek, which flows in an easterly direction and empties into the Toppenish River, a western feeder of the Yakima. This place is at an altitude of 937 feet above the sea level and is surrounded by 'scab' land. Going west from Fort Simcoe, up the slopes of the Cascade Mountains, a mile or so, one notices timber in the valleys, and as one proceeds still further up the mountains, the timber becomes thicker and of greater size. This is the beginning of the forest, which at the west side of the Cascades becomes so remarkably dense. To the east of Fort Simcoe, however, no trees are seen, except in the bottoms along the streams, while on the lower reaches of the Yakima and on the banks of the Columbia, east of here, there are absolutely no trees.

Kennewick is located on the western side of the Columbia River about six miles below the mouth of the Yakima. It is opposite Pasco, which is about three miles above the mouth of Snake River. The place is only 366 feet above the sea level and except where irrigation has been practised, there are no trees in sight, the vegetation being that typical of the desert among which are sagebrush, grease-wood and cactus. Lewis and Clark, when here on their way to the Pacific Coast, October 17, 1805,[13] saw the Indians drying salmon on scaffolds for food and fuel. Captain Clark said, "I do not think [it] at all improbable that those people make use of Dried fish as fuel. The number of dead Salmon on the Shores & floating in the river is incrediable to say ... how far they have to raft their timber they make their scaffolds of I could not learn; but there is no timber of any sort except Small willow bushes in sight in any direction."

Sentinal Bluffs is the name given to both sides of the gap where the Columbia River breaks through Saddle Mountains. It is a short distance above the head of Priest Rapids. Crab Creek empties into the Columbia from the east on the north side of these mountains. On the western side of the river, between the Bluffs and the head of Priest Rapids, there is a flat place of considerable area, portions of which the Columbia floods during the winter. Going northwest from here to Ellensburg, the trail leads up a small valley in which are several springs surrounded by some small trees. One ascends about 2000 feet to the top of the divide and then descends perhaps 1000 feet into the Kittitas Valley.