diff --git a/source/game/gameutil.c b/source/game/gameutil.c
index c53edcc..8608443 100644
--- a/source/game/gameutil.c
+++ b/source/game/gameutil.c
@@ -1898,11 +1898,11 @@ u32 GetGoodName(char* name, const char* path, bool quick) {
                 char region[8] = { 0 };
                 if (twl->region_flags == TWL_REGION_FREE) snprintf(region, 8, "W");
                 snprintf(region, 8, "%s%s%s%s%s",
-                    (twl->region_flags & TWL_REGION_JAP) ? "J" : "",
-                    (twl->region_flags & TWL_REGION_USA) ? "U" : "",
-                    (twl->region_flags & TWL_REGION_EUR) ? "E" : "",
-                    (twl->region_flags & TWL_REGION_CHN) ? "C" : "",
-                    (twl->region_flags & TWL_REGION_KOR) ? "K" : "");
+                    (twl->region_flags & REGION_MASK_JPN) ? "J" : "",
+                    (twl->region_flags & REGION_MASK_USA) ? "U" : "",
+                    (twl->region_flags & REGION_MASK_EUR) ? "E" : "",
+                    (twl->region_flags & REGION_MASK_CHN) ? "C" : "",
+                    (twl->region_flags & REGION_MASK_KOR) ? "K" : "");
                 if (strncmp(region, "JUECK", 8) == 0) snprintf(region, 8, "W");
                 if (!*region) snprintf(region, 8, "UNK");
                 
@@ -1926,12 +1926,12 @@ u32 GetGoodName(char* name, const char* path, bool quick) {
             char region[8] = { 0 };
             if (smdh->region_lockout == SMDH_REGION_FREE) snprintf(region, 8, "W");
             snprintf(region, 8, "%s%s%s%s%s%s",
-                (smdh->region_lockout & SMDH_REGION_JAP) ? "J" : "",
-                (smdh->region_lockout & SMDH_REGION_USA) ? "U" : "",
-                (smdh->region_lockout & SMDH_REGION_EUR) ? "E" : "",
-                (smdh->region_lockout & SMDH_REGION_CHN) ? "C" : "",
-                (smdh->region_lockout & SMDH_REGION_KOR) ? "K" : "",
-                (smdh->region_lockout & SMDH_REGION_TWN) ? "T" : "");
+                (smdh->region_lockout & REGION_MASK_JPN) ? "J" : "",
+                (smdh->region_lockout & REGION_MASK_USA) ? "U" : "",
+                (smdh->region_lockout & REGION_MASK_EUR) ? "E" : "",
+                (smdh->region_lockout & REGION_MASK_CHN) ? "C" : "",
+                (smdh->region_lockout & REGION_MASK_KOR) ? "K" : "",
+                (smdh->region_lockout & REGION_MASK_TWN) ? "T" : "");
             if (strncmp(region, "JUECKT", 8) == 0) snprintf(region, 8, "W");
             if (!*region) snprintf(region, 8, "UNK");
             
diff --git a/source/game/nds.h b/source/game/nds.h
index 7473e62..d5c74c5 100644
--- a/source/game/nds.h
+++ b/source/game/nds.h
@@ -1,10 +1,11 @@
 #pragma once
 
 #include "common.h"
+#include "region.h"
 
 // size of the icon struct:
 // see: http://problemkaputt.de/gbatek.htm#dscartridgeicontitle
-// v0x0001 -> 0x0840 byte (contains JAP, USA, FRE, GER, ITA, ESP titles)
+// v0x0001 -> 0x0840 byte (contains JPN, USA, FRE, GER, ITA, ESP titles)
 // v0x0002 -> 0x0940 byte (adds CHN title)
 // v0x0003 -> 0x0A40 byte (adds KOR title) 
 // v0x0103 -> 0x23C0 byte (adds TWL animated icon data)
@@ -19,14 +20,6 @@
 #define TWL_UNITCODE_TWLNTR 0x02
 #define TWL_UNITCODE_TWL    0x03
 
-#define TWL_REGION_JAP      0x01
-#define TWL_REGION_USA      0x02
-#define TWL_REGION_EUR      0x04
-#define TWL_REGION_AUS      0x08
-#define TWL_REGION_CHN      0x10
-#define TWL_REGION_KOR      0x20
-#define TWL_REGION_FREE     0xFFFFFFFF
-
 // see: http://problemkaputt.de/gbatek.htm#dscartridgeicontitle
 typedef struct {
     u16 version;
diff --git a/source/game/region.c b/source/game/region.c
new file mode 100644
index 0000000..a224d53
--- /dev/null
+++ b/source/game/region.c
@@ -0,0 +1,24 @@
+#include "common.h"
+#include "region.h"
+
+// Names of system regions, short form.
+const char* const g_regionNamesShort[SMDH_NUM_REGIONS] = {
+    "JPN",
+    "USA",
+    "EUR",
+    "AUS", // mostly unused
+    "CHN",
+    "KOR",
+    "TWN",
+};
+
+// Names of system regions, long form.
+const char* const g_regionNamesLong[SMDH_NUM_REGIONS] = {
+    "Japan",
+    "Americas",
+    "Europe",
+    "Australia",
+    "China",
+    "Korea",
+    "Taiwan",
+};
diff --git a/source/game/region.h b/source/game/region.h
new file mode 100644
index 0000000..20c2cb8
--- /dev/null
+++ b/source/game/region.h
@@ -0,0 +1,31 @@
+// List of region IDs.
+
+#pragma once
+
+// TWL and CTR share region values, except that TWL doesn't have Taiwan.
+#define REGION_JPN 0
+#define REGION_USA 1
+#define REGION_EUR 2
+#define REGION_AUS 3
+#define REGION_CHN 4
+#define REGION_KOR 5
+#define REGION_TWN 6
+
+#define REGION_MASK_JPN (1u << REGION_JPN)
+#define REGION_MASK_USA (1u << REGION_USA)
+#define REGION_MASK_EUR (1u << REGION_EUR)
+#define REGION_MASK_AUS (1u << REGION_AUS)
+#define REGION_MASK_CHN (1u << REGION_CHN)
+#define REGION_MASK_KOR (1u << REGION_KOR)
+#define REGION_MASK_TWN (1u << REGION_TWN)
+
+#define TWL_REGION_FREE     0xFFFFFFFF
+#define TWL_NUM_REGIONS (REGION_KOR + 1)
+
+#define SMDH_REGION_FREE    0x7FFFFFFF
+#define SMDH_NUM_REGIONS (REGION_TWN + 1)
+
+// Names of system regions, short form.
+extern const char* const g_regionNamesShort[SMDH_NUM_REGIONS];
+// Names of system regions, long form.
+extern const char* const g_regionNamesLong[SMDH_NUM_REGIONS];
diff --git a/source/game/smdh.h b/source/game/smdh.h
index 536375e..e1ce89e 100644
--- a/source/game/smdh.h
+++ b/source/game/smdh.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "common.h"
+#include "region.h"
 
 #define SMDH_MAGIC 'S', 'M', 'D', 'H'
 #define SMDH_SIZE_DESC_SHORT    64
@@ -11,15 +12,6 @@
 #define SMDH_SIZE_ICON_SMALL    (SMDH_DIM_ICON_SMALL * SMDH_DIM_ICON_SMALL * 3) // w * h * bpp (rgb888)
 #define SMDH_SIZE_ICON_BIG      (SMDH_DIM_ICON_BIG * SMDH_DIM_ICON_BIG * 3) // w * h * bpp (rgb888)
 
-#define SMDH_REGION_JAP         0x01
-#define SMDH_REGION_USA         0x02
-#define SMDH_REGION_EUR         0x04
-#define SMDH_REGION_AUS         0x08
-#define SMDH_REGION_CHN         0x10
-#define SMDH_REGION_KOR         0x20
-#define SMDH_REGION_TWN         0x40
-#define SMDH_REGION_FREE        0x7FFFFFFF
-
 // see: https://www.3dbrew.org/wiki/SMDH#Application_Titles
 typedef struct {
     u16 short_desc[0x40];