Castaway: San Juan del Sur

 — Blood vs Water was the seventeenth and final season of Castaway and was produced on March 12, 2022.

The season borrowed elements from the CBS reality television competition Survivor. Hosted by Robert, the game consisted of twenty competitors. This season revived the format of in which pairs of loved ones compete.

The two tribes, Blood and Water, were named based on the medieval proverb "blood is thicker than water", later adopting Coyopa and Hunahpu named after the Mayan God of Thunder and one of the Maya Hero Twins respectively. On day seven, a tribe swap vote occurred where the competitors voted out of the Water tribe would swap to the opposing side, replacing a member of their new tribe. Carlos and Katie who were voted out of Water moved to the new Hunahpu with Angelica and Anthony were swapped to the new Coyopa. On day fourteen after surviving a Trial by Fire, Nick was offered a new start on Hunahpu which they declined. When twelve competitors remained the tribes merged to the Blowa tribe named by Connor which is a portmanteau of Blood and Water. Connor won the season over O'Rear in a 4-3 vote.

Returning twists included Exile Island after a two season hiatus, the Double Urn from, and the tribe swap vote and Trial by Fire from. Multiple elimination style twists and moral dilemmas occurred in the pre-merge inspired by Australian Survivor. The Elimination challenge made its seventh appearance appearing when three castaways remained instead of four.

Development and Casting
The seventeenth season was announced during the season one finale of ChaosCarson's Jeopardy! Originally planned to serve as a reboot of the game, Rob opted to have an open door policy with returning alumni and new players competing with and against each other with no clear indicators. After the early success of Australian Survivor: Blood v Water, the original season (based on Survivor 41) was scrapped in favour of a second Blood vs Water season.

Casting for the season began on February 27th until March 8th. Interest in the season exceeded expectations and a planned game for sixteen players increased to twenty players. The Double Urn was renamed from "Fire" to "Blood" to match the theme of the season and retained the "Game Changers" rules at Tribal Council from Battle Royale. After the vote-swap, Blood and Water were renamed to Coyopa and Hunahpu respectively.