 niihau or niihau (; hawaiian: ) is the seventh largest of the inhabited hawaiian islands in the u.s. state of hawaii, having an area of . niihau lies  southwest of kauai across the kaulakahi channel. several intermittent playa lakes provide wetland habitats for the hawaiian coot, the black-winged stilt, and the hawaiian duck. the island is designated as critical habitat for brighamia insignis, an endemic and endangered species of hawaiian lobelioid. the united states census bureau defines niihau and the neighboring island and state seabird sanctuary of lehua as census tract 410 of kauai county, hawaii. its 2000 census population was 160;[http://factfinder.census.gov/servlet/dttable?_bm=y&-show_geoid=y&-tree_id=4001&-_caller=geoselect&-context=dt&-errmsg=&-all_geo_types=n&-mt_name=dec_2000_sf1_u_p001&-redolog=true&-transpose=n&-search_map_config=|b=50|l=en|t=4001|zf=0.0|ms=sel_00dec|dw=0.9772324544013481|dh=0.6835378893838299|dt=gov.census.aff.domain.map.englishmapextent|if=gif|cx=-160.12894285711306|cy=21.907113449251586|zl=6|pz=6|bo=318:317:316:314:313:323:319|bl=362:393:358:357:356:355:354|ft=350:349:335:389:388:332:331|fl=381:403:204:380:369:379:368|g=15000us150090303029&-panel_id=p_dt_geo_map&-_lang=en&-geo_id=14000us15007041000&-context=dt&-format=&-search_results=15000us150090303029&-ds_name=dec_2000_sf1_u census tract
Extinct_volcanoes Islands_of_Hawaii Kauai_County,_Hawaii Niihau Pliocene_volcanoes Private_islands Volcanoes_of_Hawaii