diff --git a/web/scan_terminal_filters.py b/web/scan_terminal_filters.py
index 0b9daaa6..f9fe60be 100644
--- a/web/scan_terminal_filters.py
+++ b/web/scan_terminal_filters.py
@@ -34,7 +34,7 @@ def normalize_scan_terminal_filters(
     if high_liquidity_only:
         min_liquidity = max(min_liquidity, 5000.0)
 
-    return {
+    result: Dict[str, Any] = {
         "scan_mode": str(raw.get("scan_mode") or "tradable").strip().lower()
         or "tradable",
         "min_price": float(min_price),
@@ -49,6 +49,10 @@ def normalize_scan_terminal_filters(
         "limit": max(1, min(safe_int(raw.get("limit"), 25), 100)),
         "max_spread": max(0.0, _safe_float(raw.get("max_spread")) or 0.03),
     }
+    trading_region = str(raw.get("trading_region") or "").strip().lower()
+    if trading_region and trading_region not in ("all", ""):
+        result["trading_region"] = trading_region
+    return result
 
 
 def market_region_from_tz_offset(tz_offset_seconds: Any) -> Dict[str, object]:
@@ -61,12 +65,12 @@ def market_region_from_tz_offset(tz_offset_seconds: Any) -> Dict[str, object]:
         return {"key": "east_asia", "label_en": "East Asia", "label_zh": "东亚", "sort_order": 1}
     if tz_hours >= 7:
         return {"key": "southeast_asia", "label_en": "Southeast Asia", "label_zh": "东南亚", "sort_order": 2}
-    if tz_hours >= 5:
+    if tz_hours >= 4.5:
         return {"key": "central_asia", "label_en": "Central / South Asia", "label_zh": "中亚 / 南亚", "sort_order": 3}
-    if tz_hours >= 3:
-        return {"key": "west_asia", "label_en": "West Asia", "label_zh": "西亚", "sort_order": 4}
-    if tz_hours >= 0:
+    if tz_hours >= 2:
+        return {"key": "west_asia", "label_en": "West Asia / Middle East", "label_zh": "西亚 / 中东", "sort_order": 4}
+    if tz_hours >= -2:
         return {"key": "europe_africa", "label_en": "Europe / Africa", "label_zh": "欧洲 / 非洲", "sort_order": 5}
-    if tz_hours >= -5:
-        return {"key": "south_america", "label_en": "South America", "label_zh": "南美洲", "sort_order": 6}
-    return {"key": "north_america", "label_en": "North America", "label_zh": "北美洲", "sort_order": 7}
+    if tz_hours >= -4:
+        return {"key": "south_america", "label_en": "Latin America", "label_zh": "拉美", "sort_order": 6}
+    return {"key": "north_america", "label_en": "North America", "label_zh": "北美", "sort_order": 7}