- Provincia Napo-Pastaza, Canton Napo. Sabata, near Archidona.1
- Ptari-tepui1
- Ptari-tepuí, between "Cave Rock" and base of high sandstone bluffs.1
- Putumayo1
- Rio Cuao, Rio Orinoco. Above Cuao Creek1
- Rio Grande1
- Rio Grande, ad rupes madidas arborumque truncos.1
- Rio Pontanari1
- Rio Pontanari.1
- Road from Pamplona to Toledo, crossing the divide between Río La Teja (Maracaibo drainage) and Río Mesme (Orinoco drainage)1
- Road from Pamplona to Toledo, crossing the divide between Río La Teja (Maracaibo drainage) and Río Mesme (Orinoco drainage).1
- Ruinas Machu Picchu, Valley of Rio Urubamba, 80 km. WNW of Cuzco. Base of Huayna Picchu, W-end of ruins.1
- Río Negro, Pto. Frías, camino al verisquero Frías.1
- Santiago1
- Sarare. Gibraltar.1
- Serra (d)os Orgaos.1
- Serra da Lua, Rio Urubu between Cachoeira Iracema and Natal.1
- Serra da Piedade.1
- Serra dos Orgaos1
- Serra dos Orgaos.1