diff --git a/crates/coremem/src/geom/region/mod.rs b/crates/coremem/src/geom/region/mod.rs
index c14bf25..8b529a7 100644
--- a/crates/coremem/src/geom/region/mod.rs
+++ b/crates/coremem/src/geom/region/mod.rs
@@ -172,6 +172,9 @@ impl<R1, R2> Intersection<R1, R2> {
     pub fn new2(r1: R1, r2: R2) -> Self {
         Self(r1, r2)
     }
+    pub fn new3<R3: Region>(r1: R1, r2: R2, r3: R3) -> Intersection<Self, R3> {
+        Intersection::new2(r1, r2).and(r3)
+    }
     pub fn region0_of_2(&self) -> &R1 {
         &self.0
     }