Route nationale 11a (RN 11a) is a secondary highway in Madagascar of 204 km, running from Antsampanana to Mahanoro, to the Mangoro River. It crosses the region of Atsinanana.^[1]

Selected locations on route

(north to south)

• Antsampanana junction with RN2
• Vatomandry
• Mahanoro – 238 km

It continues as RN 11 from Mahanoro - Nosy Varika - 204 km - Mananjary