Surface trust lands are displayed and summarized in a table by Tribal entity. A Tribal entity may be a federally recognized tribe or a constituent component of a federally recognized tribe. For each Tribal entity in the table the total trust acreage is given as well as the breakout of tribal trust and allotted trust acreage. Tribal trust lands are those where a tribe is the named landowner, and the tribe has a full percentage ownership interest in the tract division. Allotted trusts consist of two definitions of allotted. An allotted land may be a land where the tribe is the named landowner but only has a partial percentage interest in the tract division. An allotted land may also be one in which an individual associate of a tribe has any percentage ownership. A trust land would be any tribal, or allotted land that can be tied back the tribal entity. For any regional trust lands that do not have an identified entity interest or have a split entity interest that does not have a clear definition of the split, the trust lands are summarized in a row labeled undesignated. The Land Area Representation (LAR), BIA Regional Boundaries, Regional and BIA offices, as well as tribal entities without land are added in each region and adjacent territories when suitable to provide context. The tribal entity names are given by common use names instead of federal register names and may be further split into subdivisions within the recognized tribe. The Land Area Representation (LAR) is a combined dataset which creates a union of trust lands and reservation extents. The polygons are organized around tribal divisions and groupings and lack disambiguation between the trust land and reservation extent components. Due to the static creation date the LAR may not match different sources for components of the LAR. The Trust Asset and Accounting Management System (TAAMS) which is the system of record for trust lands is the source for records used in acreage calculations.  (Last calculated May 2025) Tribal lands are lands where the tribe is the named landowner, and the tribe has a full percentage ownership interest of a tract division. Allotted lands are those in which the tribe is the named landowner but is a partial percentage ownership interest of a tract division, or an allotment may be individually owned by a tribe associate with any percentage ownership interest in a tract division. Trust lands are the summed totals of tribal and allotted interests for a tribal entity. LAR – Land Area Representation is a combined dataset which creates a union of trust lands and reservation extents. The polygons are organized around tribal divisions and groupings and lack disambiguation between the trust land and reservation extent components. TAAMS – The Trust Asset and Accounting Management System which is the system of record for trust land transactions and the source for records used in acreage calculations.