diff --git a/deployments/prod.browser/environment.py b/deployments/prod.browser/environment.py
new file mode 100644
index 000000000..395d75f20
--- /dev/null
+++ b/deployments/prod.browser/environment.py
@@ -0,0 +1,41 @@
+from collections.abc import (
+    Mapping,
+)
+import json
+from typing import (
+    Optional,
+)
+
+
+def env() -> Mapping[str, Optional[str]]:
+    """
+    Returns a dictionary that maps environment variable names to values. The
+    values are either None or strings. String values can contain references to
+    other environment variables in the form `{FOO}` where FOO is the name of an
+    environment variable. See
+
+    https://docs.python.org/3.11/library/string.html#format-string-syntax
+
+    for the concrete syntax. These references will be resolved *after* the
+    overall environment has been compiled by merging all relevant
+    `environment.py` and `environment.local.py` files.
+
+    Entries with a `None` value will be excluded from the environment. They
+    can be used to document a variable without a default value in which case
+    other, more specific `environment.py` or `environment.local.py` files must
+    provide the value.
+    """
+    return {
+        'azul_terraform_component': 'browser',
+        'azul_browser_sites': json.dumps({
+            'browser': {
+                'zone': 'explore.data.humancellatlas.org',
+                'domain': 'explore.data.humancellatlas.org',
+                'project': 'ucsc/data-browser',
+                'branch': 'ucsc/hca/prod',
+                'tarball_name': 'hca',
+                'tarball_path': 'out',
+                'real_path': ''
+            }
+        })
+    }