Here are a few links to photo collections of Japanese manhole covers.

- Okachin Manhole Cover Gallery: This collection of 1,000+ manhole cover photos is organized by prefecture. Use the links on the left side of the page to navigate the site.

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- Flickr Pool -- Japanese Manhole Covers: Over 400 great photos here.

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- Design Manhole Collection: To use this interactive map, click a prefecture and then click the town names in the grid on the following page to display the manholes for that area. Click each photo to enlarge.

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- Manhole Map: This interactive map by the Journal of Sewerage Monthly contains hundreds of photos organized by prefecture and town. Click a prefecture on the map, and then click the links on the following page to display the manhole covers for each town.

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- Kyoto Manhole Covers: The Kyoto prefecture website has several dozen photos of manhole covers used in towns around the prefecture. Click each photo to enlarge.

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- Manhole Blog: Lots of manhole cover photos from northern Japan. Use the ???? ("previous page") link in the bottom-left corner to scroll through the site.

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- Manhole Box: Six pages of manhole cover photos.

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- Google image search for Manhole/ Manhole cover/ Design manhole: Lots more here.