Route nationale 1a (RN 1a) is a secondary highway in Madagascar, running from Maintirano to Tsiroanomandidy. It crosses the region of Bongolava and Melaky

(west to east)

• Maintirano
• Amparihimanga
• Tsiroanomandidy - (intersection with RN 1a to Maintirano and RN 1b )

• List of roads in Madagascar
• Transport in Madagascar