diff --git a/src/git_flow/command/merge.py b/src/git_flow/command/merge.py
index 98af465..a773267 100644
--- a/src/git_flow/command/merge.py
+++ b/src/git_flow/command/merge.py
@@ -13,7 +13,23 @@ def merge():
     ensure_initialized()
 
     branch = ensure_right_branch()
-    target, _ = get_branch_env_and_type(branch)
+    environments = flowconfig["flow.branches"].split(",")
+
+    if branch in environments:
+        if branch == environments[-1]:
+            raise GitFlowError("No se puede hacer un merge del último entorno.")
+
+        panel(
+            "Merge de entornos",
+            """Está por hacer un merge de 2 entornos que puede implicar muchos cambios en el proyecto.""",
+        )
+
+        if not confirm("¿Desea continuar?"):
+            raise GitFlowError("Ejecución abortada")
+
+        target = environments[environments.index(branch) + 1]
+    else:
+        target, _ = get_branch_env_and_type(branch)
 
     if "flow.remote" in flowconfig:
         remote = flowconfig["flow.remote"]