/django/contrib/gis/db/models/__init__.py

# Want to get everything from the 'normal' models package.
from django.db.models import *

# Geographic aggregate functions
from django.contrib.gis.db.models.aggregates import *

# The GeoManager
from django.contrib.gis.db.models.manager import GeoManager

# The geographic-enabled fields.
from django.contrib.gis.db.models.fields import \
     GeometryField, PointField, LineStringField, PolygonField, \
     MultiPointField, MultiLineStringField, MultiPolygonField, \
     GeometryCollectionField