Haïti poliovirus environmental surveillance sites during March 2017–December 2019, site locations. (A) Location of the cities of Cap Haïtien, Gonaïves, Port au Prince, and Saint Marc. Poliovirus environmental surveillance sampling sites in (B) Port au Prince (BDC = Bois de Chêne, BNF = Bois de Neuf, CAC = Cite au Cayes, CAR = Carrefour, and RRD = Route Rails Diquini; the MAC site is not shown [17]); (C) Gonaïves: (ALL = Avenue Leon Legros, ATP = Autorité Portuaire, BRA = Boulevard de l’Avenir, KHF = Key Soleil Health Facility, KHS = Key Soleil School, and KSB = Key Soleil Bridge); (D) Saint Marc (AMA = Avenue Maurepas, HUC = Impasse Hucar, and PET = Rue Petion); (E) Cap Haïtien (RNB = Route National Bridge); and (F) Cap Haïtien (CRC = Ruelle Caporis, GRC = Grand Rue Champin, IMP = Impasse Petion, CMB = Rivière Commerce Bridge, and RPA = Ruelle Patience). Watershed boundaries for each sampling site are indicated in green shading, except for ATP, where the boundaries could not be determined [17,24].