שקלים Shekalim
Seder Mo'ed · 21 dapim · 2a – 22b
The Bavli has no Gemara on Shekalim, so the Vilna Shas prints the Yerushalmi's in its place — and the Daf Yomi cycle learns it here.
Shekalim in the Jerusalem Talmud — the same Gemara, set by chapter and halachah
A tractate opens at daf 2 — page 1 is its title page, which carries no text. Each page opens at amud a; the reader flips to b at the top, or walks on with the arrows.