• Area: 251 square miles
• Population: 85,778 (2000 census)
• Persons/Sq. Mile: 341.7
• (Highest Density in SW Virginia)
• % Karst Terrane: approx. 20%
• Number of Reported Caves: 81
• Surveyed Cave Passage: 5 miles
• Longest Cave: 13,200 feet
• Average Length: 337 feet
• Deepest Cave: 350 feet

Major Karst Development Areas:

• Roanoke Valley
• Minor Valleys

Karstic Formations and Map Symbols:

• Helderberg - DSu
• Undivided Ordovician - Ou

Detailed Map - Click to View:

• Roanoke County Map Roanoke County Map
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