<page_title> List of largest nebulae </page_title> <section_title> List </section_title> <table> <cell> NGC 604 <col_header> Nebula </col_header> </cell> <cell> 1,520 ly (470 pc) <col_header> Size (ly/pc) </col_header> </cell> <cell> H II region <col_header> Type </col_header> </cell> </table>
NGC 604 is among the largest H II regions, whose diameter is roughly 1,520 light years.