The Route nationale 21 (RN 21) is a 50 km long national road on the island of Nosy Boraha (Sainte Marie) in the Analanjirofo region off the northeast coast of Madagascar. It begins at the airport in the south of the elongated island and heads north via the island's capital Ambodifotatra along the west coast to the north of the island.
| National roads |
N 1 • N 1bis • N 2 • N 2bis • N 3 • N 3a • N 3b • N 4 • N 5 • N 5a • N 6 • N 7 • N 8 • N 8a • N 8b • N 8c • N 9 • N 10 • N 11 • N 11a • N 12 • N 12a • N 13 • N 14 • N 15 • N 16 • N 17 • N 17a • N 18 • N 19 • N 20 • N 21 • N 22 • N 23 • N 23a • N 24 • N 25 • N 26 • N 27 • N 30 • N 30a • N 31 • N 31a • N 32 • N 33 • N 33a • N 33b • N 34 • N 35 • N 36 • N 41 • N 42 • N 43 • N 44 • N 45 • N 46 • N 47 • N 51 • N 52 • N 53 • N 54 • N 55 • N 56 • N 57 • N 58a • N 58b • N 59a • N 59b • N 60 |
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