diff --git a/snark-storage-driver/src/main/kotlin/space/kscience/snark/storage/Config.kt b/snark-storage-driver/src/main/kotlin/space/kscience/snark/storage/Config.kt
index 0b870eb..5cf24de 100644
--- a/snark-storage-driver/src/main/kotlin/space/kscience/snark/storage/Config.kt
+++ b/snark-storage-driver/src/main/kotlin/space/kscience/snark/storage/Config.kt
@@ -6,6 +6,8 @@ import space.kscience.snark.storage.s3.s3Bucket
 import space.kscience.snark.storage.s3.s3Storage
 import java.nio.file.Path
 
+private const val DEFAULT_REGION = "arctic-vault"
+
 public sealed interface Config {
     public fun build(): Directory
 }
@@ -16,20 +18,23 @@ public data class LocalConfig(val path: Path): Config {
     }
 }
 
+/*
+ * `~/.aws/credentials.json file is required
+ */
 internal fun buildS3Client(regionSpec: String): S3Client {
     return S3Client {
         region = regionSpec
     }
 }
 
-public data class S3BucketConfig(val bucketName: String): Config {
+public data class S3BucketConfig(val bucketName: String, val region: String = DEFAULT_REGION): Config {
     override fun build(): Directory {
-        return s3Bucket(buildS3Client("eu-east"), bucketName)
+        return s3Bucket(buildS3Client(region), bucketName)
     }
 }
 
-public object S3ServiceConfig: Config {
+public data class S3ServiceConfig(val region: String = DEFAULT_REGION): Config {
     override fun build(): Directory {
-        return s3Storage(buildS3Client("eu-east"))
+        return s3Storage(buildS3Client(region))
     }
 }
diff --git a/snark-storage-driver/src/test/kotlin/space/kscience/snark/storage/JustCreates.kt b/snark-storage-driver/src/test/kotlin/space/kscience/snark/storage/JustCreates.kt
index ef9478a..43e8144 100644
--- a/snark-storage-driver/src/test/kotlin/space/kscience/snark/storage/JustCreates.kt
+++ b/snark-storage-driver/src/test/kotlin/space/kscience/snark/storage/JustCreates.kt
@@ -7,7 +7,7 @@ class JustCreates {
 
     @Test
     fun s3Created() {
-        val dir = Directory.fromConfig(S3ServiceConfig)
+        val dir = Directory.fromConfig(S3ServiceConfig())
         dir.close()
     }