In Paper Mario for Nintendo64, where is the sewer pipe that leads to Yoshi Island?

I need to know this apparently because this leads to the next place after Flower Fields

In Paper Mario for Nintendo64, where is the sewer pipe that leads to Yoshi Island?
If you want to go to Lavalava Island (that's Yoshi Island), then when you go down the main pipe to the tunnles, there should be a wooden panel a bit to the left of where you entered. You need to do a spin jump (after Boo's Mansion) to break through. You need to have Sushie (from Lavalava Island) to swim across the water. You'll also have to fight a Blooper, so be prepared. Then go through the door, past the spikes, through the next door, and through the icy blue door to get to the icy place (after Flower Fields). Hope this helps!

Crooked Teeth