In Trinity Trigger, you can find the below chests at Waterways: Southwest.
Area 1
This area is near the entrance to Urbantheria.
Dispel Stone II
This item comes from a mimic chest just east of the starting area.
Life Stone III
This item comes from a mimic chest in the northern part of the area. To reach it, you’ll need to cut through tentacles.
Super Potion
This chest can be found along the western edge of the area.
Antidote x2
This chest can be found in the south central part of the area.
Medicine Stone II
This item comes from a mimic chest on the southern edge of the map.
Skill Stone II
This item comes from a silver mimic chest in the eastern part of the area near a lever.
Slow Defense III
To reach this chest, pull the lever near the above mimic then head down the nearby stairs.
Area 2
To reach this area, take the southeastern map transition in Area 1.
Writhing Root x3
This chest can be found in the northern part of the area.
Writing Root x3
This chest can be found in the northeastern corner of the area.
Lucky Stone II
This mimic chest can be found in the south-central part of the area near a lever.
Yellow Gel x3
This chest can be found behind a flow of water in the south-central part of the area. Pull the lever west of it to stop the water.
Quality Red Beryl x7
This chest can be found in the southwestern corner of the area.
Area 3
To reach this area, take the northeastern map transition in Area 1.
Dodge Stone II
This mimic chest can be found at the start of the area where the hard enemy spawns.
Foul-Smelling Liquid x5 / Synchro Stone II / Super elixir
These chests can be found on the southwestern side of the area. The middle one is a mimic!
Untouchable Jewel II
This chest can be found along the southern edge of the map.
Lucky Stone II / Divine Extract x2
These chests can be found on the southeastern side of the area. The southern one is a mimic!