<P> David J. Peterson, who created Dothraki for Game of Thrones, developed the Trigedasleng language for The Grounders . Jason Rothenberg said it was similar to Creole English . </P> <P> After his constructed language work on Star - Crossed, Peterson was contacted by the producers of The 100 to create a language for the Grounders, an evolution of English . In the setting, around 250 years have passed since the apocalypse, which is a very short time for significant language change . Because of this, Peterson posited an accelerated evolution in which the early Grounders used a cant specifically to obfuscate their speech and to differentiate between friend or foe . Trigedasleng derives from that cant and evolved over several short generations of survivors of the apocalypse . </P> <P> Filming for the series takes place in and around Vancouver, British Columbia . Production on the pilot occurred during the second quarter of 2013 . After the show was picked up to series, filming occurred for the first season between August 2013 and January 2014 . Filming for the second season commenced on July 7, 2014, and concluded on January 23, 2015 . The third season was filmed between July 15, 2015, and February 2, 2016 . Filming for the fourth season commenced on August 2, 2016, and concluded on January 18, 2017 . Filming for the fifth season commenced on August 14, 2017, and wrapped up on January 27, 2018 . </P> <P> In late February 2013, Bob Morley and Eli Goree were cast as Bellamy Blake and Wells Jaha, respectively, followed a day later by the casting of Henry Ian Cusick as Marcus Kane . Less than a week later, Eliza Taylor and Marie Avgeropoulos were cast in co-starring roles as Clarke Griffin and Octavia Blake, respectively . Throughout March, the rest of the cast was filled out, with Paige Turco cast as Abigail Walters (now Abigail Griffin), Isaiah Washington as Chancellor Jaha, Thomas McDonnell as Finn Collins, Kelly Hu as Callie Cartwig, and Christopher Larkin as Monty Green . </P>

Where did they film the 100 season 5