what us state forms the western boundary of montana
Idaho
title: Montana text: the original name of Montana was adopted. Montana is one of the nine Mountain States, located in the north of the region known as the Western United States. It borders North Dakota and South Dakota to the east. Wyoming is to the south, Idaho is to the west and southwest, and three Canadian provinces, British Columbia, Alberta, and Saskatchewan, are to the north. With an area of , Montana is slightly larger than Japan. It is the fourth largest state in the United States after Alaska, Texas, and California; it is the largest landlocked U.S. state. The state's topography is title: U.S. state text: followed various geographic features (such as rivers or mountain range peaks), and were influenced by settlement or transportation patterns. At various times, national borders with territories formerly controlled by other countries (British North America, New France, New Spain including Spanish Florida, and Russian America) became institutionalized as the borders of U.S. states. In the West, relatively arbitrary straight lines following latitude and longitude often prevail, due to the sparseness of settlement west of the Mississippi River. Once established, most state borders have, with few exceptions, been generally stable. Only two states, Missouri (Platte Purchase) and Nevada, grew appreciably after statehood. title: Mason–Dixon line text: Mason–Dixon line The Mason–Dixon line, also called the Mason and Dixon line or Mason's and Dixon's line, was surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon in the resolution of a border dispute involving Maryland, Pennsylvania, and Delaware in Colonial America. It is still a demarcation line among four U.S. states, forming part of the borders of Pennsylvania, Maryland, Delaware, and West Virginia (originally part of Virginia before 1863). Later it became known as the border between the Northern United States and the Southern United States. Before the Missouri Compromise, the line (west of Delaware) marked the title: Mountain states text: Mountain states The Mountain States (also known as the Mountain West and the Interior West) form one of the nine geographic divisions of the United States that are officially recognized by the United States Census Bureau. It is a subregion of the Western United States. The Mountain States generally are considered to include: Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, and Wyoming. The words "Mountain States" generally refer to the US States which encompass the US Rocky Mountains. These are oriented north-south through portions of the states of Montana, Idaho, Wyoming, Colorado, Utah, and New Mexico. Arizona and Nevada, title: Montana text: roughly defined by the Continental Divide, which splits much of the state into distinct eastern and western regions. Most of Montana's 100 or more named mountain ranges are in the state's western half, most of which is geologically and geographically part of the Northern Rocky Mountains. The Absaroka and Beartooth ranges in the state's south-central part are technically part of the Central Rocky Mountains. The Rocky Mountain Front is a significant feature in the state's north-central portion, and isolated island ranges that interrupt the prairie landscape common in the central and eastern parts of the state. About 60 percent of