"The tropical zone was a region on Risa. It contained jungle. While working for the V'Shar in 2135, T'Pol tracked two rogue operatives to the tropical zone, killing one. (ENT: \"The Seventh\")"@en . . "The tropical zone was a region on Risa. It contained jungle. While working for the V'Shar in 2135, T'Pol tracked two rogue operatives to the tropical zone, killing one. (ENT: \"The Seventh\")"@en . "Tropical zone"@en . .