What Are Bordering Countries? Definition & Examples

Bordering countries (also called neighboring countries or adjacent countries) are sovereign states that share a land or maritime boundary. The boundary may be defined by treaties, natural features (rivers, mountains), or geometric lines.

Types of Borders

• Land borders: Contiguous territory contact (e.g., US-Canada, France-Germany)
• Maritime borders: Exclusive Economic Zones (EEZ) or territorial waters meet (e.g., UK-France, Japan-South Korea)
• River/lake borders: Water bodies form boundaries (e.g., US-Mexico/Rio Grande, Tanzania-Uganda/Lake Victoria)
• Condominiums: Shared sovereignty (rare: Sudan-Egypt/Bir Tawil—actually unclaimed; Saudi Arabia-Kuwait Neutral Zone—former)

Notable Examples

• China & Russia: 14 land neighbors each (most globally)
• Brazil: Borders 10 South American countries (all except Chile, Ecuador)
• DR Congo: 9 neighbors
• Germany: 9 neighbors (Denmark, Poland, Czechia, Austria, Switzerland, France, Luxembourg, Belgium, Netherlands)
• Island nations: Zero land borders (Japan, Australia, Madagascar, Sri Lanka) but maritime neighbors

Special Cases

• Enclaves: Country entirely within another (Lesotho in South Africa, Vatican City/San Marino in Italy)
• Exclaves: Territory separated from main body (Alaska, Kaliningrad, Cabinda)
• Baarle-Hertog/Baarle-Nassau: Belgian/Dutch enclaves within each other—world's most complex border
• Diomede Islands: US (Little Diomede) and Russia (Big Diomede) 2.4 mi apart—International Date Line

Why It Matters

Border relationships shape trade, migration, security, environmental management, and cultural exchange. The world has ~300 land borders and ~400 maritime boundaries—each a nexus of cooperation and/or conflict.