A local hospital district may be organized, incorporated and managed, as provided in this division and may exercise the powers herein granted or necessarily implied. Such a district may include incorporated or unincorporated territory, or both, or territory in any one or more counties. The territory comprising this district need not be contiguous but the territory of a municipal corporation shall not be divided; provided, that land either in a municipal corporation or in unincorporated territory which the supervising authority finds will not be benefited shall not be included.