Quick answer: Honkai Star Rail version 4.0 introduces approximately 133 treasure chests across the new Planarcadia world, distributed among five distinct maps: Duomension City, Graphia Academy, Phantasmoon Courtyard, "World’s End" Tavern, and Dovebrook District.
The release of Honkai Star Rail version 4.0 adds the world of Planarcadia, bringing five expansive maps filled with exploration objectives. Players can collect over 133 treasure chests throughout these new zones. While many chests are located openly in the overworld, others require completing puzzles, engaging in the Interplanar Jump, or participating in mini-games.
Below is a breakdown of the treasure chest locations and counts for each area in Planarcadia.

Duomension City
Duomension City contains approximately 36 treasure chests. This total includes standard overworld chests as well as two specific Furbobo Treasures. The area is dense with rewards, requiring thorough exploration of its unique dimensional layout to uncover every container.
Graphia Academy
The Graphia Academy map features a total of 38 chests. Exploration in the overworld yields 27 of these chests directly. To obtain the remaining treasures, players must engage with specific gameplay mechanics, including Intraplanar Jumps and various mini-games integrated into the academy's grounds.

Phantasmoon Courtyard
Phantasmoon Courtyard is a smaller area containing only two treasure chests. Both are relatively straightforward to locate; moving straight through the primary path of the courtyard allows players to find them sequentially without complex navigation.
"World’s End" Tavern
The "World’s End" Tavern holds a significant number of rewards, with 29 chests available for collection. Notably, seven of these chests are concentrated in a single location within the tavern map, making it a high-value spot for quick resource gathering.

Dovebrook District
Dovebrook District rivals Duomension City in size, containing around 36 treasure chests. Among these, three are classified as Furbobo Treasures. Players should comb through the district carefully to ensure all 36 are accounted for.
Chest rewards and mechanics
Opening treasure chests in Planarcadia provides various resources essential for progression. Common rewards include Trailblaze EXP, Credits, and upgrade materials for Characters, Relics, and Light Cones. The amount of Stellar Jade obtained varies by chest type:
- Basic Treasure: 5 Stellar Jade
- Bountiful Treasure: 20 Stellar Jade
- Precious Treasure: 30 Stellar Jade
Treasure chests in Honkai Star Rail do not respawn. Once a chest is opened and its contents claimed, it disappears from the map permanently.