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diff --git a/courgette/region.h b/courgette/region.h
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+++ b/courgette/region.h
@@ -0,0 +1,62 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COURGETTE_REGION_H_
+#define COURGETTE_REGION_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace courgette {
+
+// A Region is a descriptor for a region of memory.  It has a start address and
+// a length measured in bytes.  The Region object does not own the memory.
+//
+class Region {
+ public:
+  // Default constructor: and empty region.
+  Region() : start_(NULL), length_(0) {}
+
+  // Usual constructor for regions given a |start| address and |length|.
+  Region(const void* start, size_t length)
+      : start_(static_cast<const uint8*>(start)),
+        length_(length) {
+  }
+
+  // String constructor.  Region is owned by the string, so the string should
+  // have a lifetime greater than the region.
+  explicit Region(const std::string& string)
+      : start_(reinterpret_cast<const uint8*>(string.c_str())),
+        length_(string.length()) {
+  }
+
+  // Copy constructor.
+  Region(const Region& other) : start_(other.start_), length_(other.length_) {}
+
+  // Assignment 'operator' makes |this| region the same as |other|.
+  Region& assign(const Region& other) {
+    this->start_ = other.start_;
+    this->length_ = other.length_;
+    return *this;
+  }
+
+  // Returns the starting address of the region.
+  const uint8* start() const { return start_; }
+
+  // Returns the length of the region.
+  size_t length() const { return length_; }
+
+  // Returns the address after the last byte of the region.
+  const uint8* end() const { return start_ + length_; }
+
+ private:
+  const uint8* start_;
+  size_t length_;
+
+  void operator=(const Region&);  // Disallow assignment operator.
+};
+
+}  // namespace
+#endif  // COURGETTE_REGION_H_