The present disclosure relates to corner profiles and/or corner reinforcement for liners and linings that are suitable for use with tanks and other storage/containment vessels, such as process tanks, immersion tanks, indoor or outdoor containment pits, gravity feed conduits (e.g., concrete trench, canal, or drain, etc.) for transferring or conveying liquid, grain storage tanks or containers (e.g., dielectric or electrically non-conductive liners for grain storage, etc.), etc. The present disclosure also relates to tanks and other storage/containment vessels including liners and linings with corner profiles and/or corner reinforcement. Additionally, the present disclosure relates to methods, systems, and apparatus for providing corner profiles and/or corner reinforcement for liners and linings.