Category Nuances matching boundary:

• natural,
• physical,
• structural,
• rigid,
• permanent,
• solid,
• curved,
• critical,
• outer,
• hierarchical,
• geopolitical,
• historical,
• biological,
• atmospheric,
• oceanic,
• legal,
• smooth,
• political,
• real,
• semitransparent,
• spatial,
• jurisdictional,
• irregular,
• convenient,
• visual,
• spherical,
• hexagonal,
• fixed,
• clear,
• moving,
• complex,
• geographical,
• governing,
• external,
• cultural,
• nearby,
• artificial,
• syntactic,
• vertical,
• static,
• sharp,
• internal,
• horizontal,
• logical,
• smaller,
• simple,
• front,
• hydraulic,
• nonconducting,
• single,
• distinct,
• significant,
• ecological,
• hard,
• administrative,
• geological,
• crystalline,

Members for simple category boundary:

• town_boundary,
• coastline,
• county_border,
• phase_interface,
• bottom,
• bathymetric_edge,
• organ_surface,
• end,
• horizontal_line,
• national_border,
• construction_tape,
• scalloped_edge,
• face,
• county_boundary,
• tectonic_line,
• ground_surface,
• city_boundary,
• village_border,
• building_surface,
• existing_boundary,
• threshold_boundary,
• top,
• crystal_edge,
• international_border,
• international_boundary,
• painted_line,
• wallace_line,
• concave_boundary,
• solid_sphere,
• white_line,
• interface,
• forest_edge,
• territorial_line,
• substrate_edge,
• site_boundary,
• formation_boundary,
• seepage_face,
• track,
• free_surface,
• gi_boundary,
• precinct_boundary,
• slip_surface,
• council_boundary,
• tape,
• coast_line,
• internal_point,
• lot_line,
• airfoil_surface,
• ridge_line,
• bedding_surface,
• tissue_interface,
• geographic_boundary,
• wetting_front,
• substrate,
• circumference,
• ridge_top,
• bubble_interface,
• subdivision_boundary,
• parish_boundary,
• polar_front,
• sea-breeze_front,
• watershed_limit,
• park_boundary,
• table_boundary,
• parish_line,
• intersection_curve,
• np_boundary,
• shoreline,
• administrative_boundary,
• byte_boundary,
• political_boundary,
• animal_head,
• flow_line,
• absorbing_boundary,
• mexican_border,
• catchment_boundary,
• state_border,
• political_border,
• outflow_boundary,
• straight_line,
• field_margin,
• topographical_boundary,
• hill_range,
• inside,
• shrub_line,
• soil_surface,
• bottom_boundary,
• blade_surface,
• line,
• side,
• municipality_line,
• aerofoil_surface,
• sample_edge,
• directorate_boundary,
• range,
• wire,
• then_wave,
• county_limit,
• domain_limit,
• metal_edge,
• southern_limit,
• surface,
• border,
• ocean_interface,
• city-limit_line,
• pipe_line,
• neighborhood_boundary,
• railway_line,
• provincial_line,
• occupational_boundary,
• private_edge,
• threshold,
• village_boundary,
• green_belt,
• outside,
• shoulder,
• surf_line,
• base,
• field_border,
• legislative_boundary,
• usa_border,
• grain_boundary,
• pink_line,
• country_border,
• floor_surface,
• fire_line,
• regional_boundary,
• air_interface,
• township_boundary,
• wan_edge,
• language_frontier,
• word_boundary,
• ocean_surface,
• political_line,
• nation_border,
• water_surface,
• twin_boundary,
• nacelle_surface,
• town_line,
• river_edge,
• township_line,
• edge,
• country_line,
• symmetry_boundary,
• rough_surface,
• census_boundary,
• gust_front,
• provincial_boundary,
• municipal_boundary,