diff --git a/lib/beaver/slang.ex b/lib/beaver/slang.ex
index af63dceeb..e2aa0fbf9 100644
--- a/lib/beaver/slang.ex
+++ b/lib/beaver/slang.ex
@@ -148,7 +148,7 @@ defmodule Beaver.Slang do
           op_applier slang_target_op: op, sym_name: "\"#{name}\"" do
             region do
               block b_op() do
-                {args, ret} = constrain_f.(block: Beaver.Env.block(), ctx: ctx)
+                {args, ret} = constrain_f.(Beaver.Env.block(), ctx)
 
                 case strip_variadicity(args) do
                   [] ->
@@ -235,6 +235,26 @@ defmodule Beaver.Slang do
     for {v, i} <- Enum.with_index(args), do: transform_arg(v, i, :variable)
   end
 
+  defp do_gen_region(:any, block, ctx) do
+    mlir ctx: ctx, block: block do
+      IRDL.region() >>> ~t{!irdl.region}
+    end
+  end
+
+  defp do_gen_region({:sized, size}, block, ctx) when is_integer(size) do
+    mlir ctx: ctx, block: block do
+      IRDL.region(numberOfBlocks: MLIR.Attribute.integer(MLIR.Type.i32(), size)) >>>
+        ~t{!irdl.region}
+    end
+  end
+
+  @doc false
+  def gen_region(regions, block, ctx) do
+    regions
+    |> List.wrap()
+    |> Enum.map(&do_gen_region(&1, block, ctx))
+  end
+
   # This function generates the AST for a creator function for an IRDL operation (like `irdl.operation`, `irdl.type`). It uses the transform_defop_pins/1 function to transform the pins, generates the MLIR code for the operation and its arguments, and applies the operation using op_applier/1.
   defp gen_creator(op, args_op, call, do_block, opts \\ []) do
     {name, args} = call |> Macro.decompose_call()
@@ -259,11 +279,20 @@ defmodule Beaver.Slang do
           unquote(name),
           unquote(op),
           unquote(args_op),
-          fn opts ->
+          fn block, ctx ->
             use Beaver
 
-            mlir block: opts[:block], ctx: opts[:ctx] do
+            mlir block: block, ctx: ctx do
               unquote_splicing(input_constrains)
+
+              unquote_splicing(
+                for {ast, {mod, func}} <- opts[:extra_constrains] || [] do
+                  quote do
+                    apply(unquote(mod), unquote(func), [unquote(ast), block, ctx])
+                  end
+                end
+              )
+
               {[unquote_splicing(args_var_ast)], unquote(do_block)}
             end
           end,
@@ -341,7 +370,10 @@ defmodule Beaver.Slang do
   defmacro defop(call, block \\ nil) do
     gen_creator(:operation, :operands, call, block[:do],
       return_op: :results,
-      need_variadicity: true
+      need_variadicity: true,
+      extra_constrains: [
+        {block[:regions], {Beaver.Slang, :gen_region}}
+      ]
     )
   end
 
diff --git a/test/irdl_test.exs b/test/irdl_test.exs
index 0008f12e8..8eeb1ad20 100644
--- a/test/irdl_test.exs
+++ b/test/irdl_test.exs
@@ -67,7 +67,11 @@ defmodule IRDLTest do
 
   test "var dialect",
        test_context do
-    use Beaver
     TestVariadic.__slang_dialect__(test_context[:ctx]) |> MLIR.Operation.verify!()
   end
+
+  test "region dialect",
+       test_context do
+    TestRegion.__slang_dialect__(test_context[:ctx]) |> MLIR.Operation.verify!()
+  end
 end
diff --git a/test/support/region_dialect.ex b/test/support/region_dialect.ex
new file mode 100644
index 000000000..282fbd979
--- /dev/null
+++ b/test/support/region_dialect.ex
@@ -0,0 +1,7 @@
+defmodule TestRegion do
+  @moduledoc "An example to showcase the a region dialect in IRDL test."
+  use Beaver.Slang, name: "test_region"
+  defop any_region(i = {:single, Type.i32()}), do: [], regions: [:any]
+  defop any_region2(i = {:single, Type.i32()}), do: [], regions: [:any, :any]
+  defop sized_region(), regions: {:sized, 11}
+end