Mainmark Rock, Isles of Scilly

• Parish/Community: St. Mary's
• Unitary Authority: Isles of Scilly
• Region: South West

• Category: Water Feature
• Type: Island

• Latitude/Longitude: 49°54'37"N 6°17'36"W
• Eastings/Northings: 91857, 9977
• OS Grid: SV918099
• Mapcode Local: GBR BXVX.G24
• Mapcode Global: VGYC4.VJP1

Location and coordinates are for the approximate centre of Mainmark Rock within this administrative area. Geographic features and populated places may cross administrative borders.