Tsukiji Choseian "Anago Nanban Soba", which is said to be the longest in Japan, I went there and measured the length of the anago tempura to see how many centimeters it was!
We got an earful of information that "there is a very tasty soba (buckwheat noodle) with the longest (possibly) conger eel tempura in Japan in Tsukiji. I actually went to Tsukiji Choseian and tried (and measured) the conger eel tempura on the "Anago Nanban Soba"!