Possible Clues:

• South American river — lazy Womble
• Part of the Venezuela-Colombia border
• River past Ciudad Bolívar
• Faraway river, alternatively island, with no company
• Orion has company and flower in South America
• Venezuela divider
• River — Womble
• Gold coin exchanged, with nothing for banker
• River under the Angostura Bridge
• River, rising in Venezuela, forming part of its border with Colombia and flowing into the Atlantic