Region based memory management is a powerful tool designed with the goal of ensuring memory safety statically. The region calculus of Tofte and Talpin is a well known example of a region based system, which uses regions to manage memory in a stack-like fashion. However, the region calculus is lexically scoped and requires explicit annotation of memory regions, which can be cumbersome for the programmer. Other systems have addressed non-lexical regions, but these approaches typically require the use of a substructural type system to track the lifetimes of regions. We present \textsc{Spegion}, a language with implicit non-lexical regions, which provides these same memory safety guarantees for programs that go beyond using allocating memory in a stack-like manner in a more concise syntax. We are able to achieve this without the use of substructural types, relying instead on an effect system to enforce constraints on region allocation and deallocation. These regions may be divided into sub-regions, i.e., \textbf{Sp}littable r\textbf{Egion}s, allowing fine grained control over memory allocation. Furthermore, \textsc{Spegion} permits \emph{sized} allocations, where each value has an associated size which is used to ensure that regions are not over-allocated into. We present a type system for \textsc{Spegion} and prove that it is sound with respect to a small-step operational semantics.