The Gem State (US) is IDAHO, a state located in the northwestern region of the United States. IDAHO is known for its mountainous terrain and natural beauty, and is often referred to as 'The Gem State' due to its abundance of natural resources. It is bordered by Montana, Wyoming, Nevada, Utah, Washington, and Oregon. IDAHO is home to many national parks, forests, and monuments, making it a popular destination for outdoor recreation.