Polis

Polis is a location featured in Season Three. It is the capitol of the Coalition and where the Commander resides. In February 2150, Polis, along with Arkadia and the Floukru Rig, was under the occupation of A.L.I.E. and her followers during the uprising against her, with the Commander's throne at the highest level of the main tower being A.L.I.E.'s seat of power and base of operations during the short conflict. However, A.L.I.E. was defeated at the end of the Season Three finale.

As of Season Four, Polis became a war zone. By the end of Season Four, Polis was destroyed by the second Praimfaya.

Season Two
In Blood Must Have Blood (Part 1), Commander Lexa tells Clarke that Polis might change the way Clarke thinks about the Grounders.

Season Three
In Wanheda (Part 2), Roan delivers Clarke to Polis for the bounty offered on Clarke. Lexa receives Clarke in the throne room at the top of the tower and tells Clarke she needs her help.

Season Four
In Echoes, Polis is forcefully taken by Azgeda. Echo takes charge of the Ice Nation army occupying Polis and declares the city to be under Azgeda rule. When King Roan regains consciousness, he adopts the Coalition as formed by Lexa, including Skaikru as the 13th clan. Kane, as Skaikru's ambassador becomes a resident of Polis.

In God Complex, Kane, Monty and Jaha go to Polis to meet Gaia. They find the bunker under the temple in Polis controlled by Azgeda. Indra moves her guards to guard the temple.

In Praimfaya, Polis is destroyed by the second Praimfaya, and six years later, Clarke mentions that the city is in ruins.

Location
The settlement looks to be located on the top of some rolling hills, lush with vegetation. The tallest building is the high tower where the Commander resides. It is unknown where the capitol is located exactly, but based on travelling distance from and to Arkadia, it is possibly located near of what was Baltimore.

Tower
The tower is the home of the Commander.

Temple
The temple is used by the Flamekeepers. Becca's escape pod is stored within the temple.

Becca's Crypt
Becca's Crypt is a bunker located underneath the temple. The bunker was originally used by the Second Dawn cult.

Notes and Trivia

 * The name is not the shortened name of an American location, unlike Tondc.
 * It is the shortened name of the thirteenth space station, Polaris.
 * Polis has been added to the opening credits of Season Three.
 * The location of Polis was out of the range of any direct missile blasts during the Nuclear Apocalypse.
 * The tower of Polis, a relic from before the apocalypse, is the tallest structure shown on the show as of Season Three.
 * On a population list seen in "Heavy Lies the Crown", Polis is listed having 4,000 people including 400 children.
 * As of "Praimfaya", Polis is in ruins and the tower has collapsed.
 * The Second Dawn Bunker is covered by rubble, locking the occupants inside.