What features should I look for in an expedition bicycle to ensure it is suitable for long-distance travel?

When choosing an expedition bicycle for long-distance travel, look for features such as a sturdy frame, reliable gears and brakes, comfortable saddle, durable tires, and mounting points for racks and panniers. Additionally, consider features like a wide gear range, disc brakes for better stopping power, and a comfortable riding position for extended hours on the bike.